Pt/Alumina Hyperbolic Metafilms with High-Temperature Stability, Wide Wavelength Tunability, and Omnidirectional Absorption

Cited 9 time in webofscience Cited 0 time in scopus
  • Hit : 114
  • Download : 0
The authors report high-temperature stable, spectrally tunable, Pt/alumina hyperbolic metafilms with broadband absorption. Two uniform pairs of Pt (10nm)/alumina (100, 150, or 200nm) multilayer films with a top alumina passivation layer and a bottom Pt mirror and are prepared on sapphire substrates by sputtering. These Pt/alumina multilayer films yielded strong light absorption at visible to near-infrared wavelengths that are spectrally tunable by modulating the thickness of each alumina layer. Based on effective medium theory for 1D metafilms, such tuning behavior is well understood; the maximum absorption occurred at a specific range of wavelengths wherein the real part of the effective permittivity was near-zero. The broadband absorption spectrum is only marginally altered over a wide range of incident angles from 0 to 70 degrees, a finding supported by simulations using the transfer matrix method using the experimentally derived optical constants of Pt and alumina. The fabricated Pt/alumina multilayer films maintained their initial absorption spectra after a heating test at 1450K for 12h. Transmission electron microscopy images and fast Fourier transform diffraction patterns show pristine Pt/alumina interfaces, devoid of any features related to oxidation, interdiffusion, and deformation after the heating test. These pristine interfaces are further verified with the elemental mapping results obtained by energy dispersion X-ray spectroscopy. This work demonstrates that a one-dimensional stack of Pt and alumina layers with deep-submicron thicknesses functions as a refractory hyperbolic metamaterial with a large absorption at specific wavelengths, which will be extensively utilized in a diverse range of thermal radiation-engineered applications.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2018-07
Language
English
Article Type
Article
Citation

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, v.215, no.14

ISSN
1862-6300
DOI
10.1002/pssa.201800287
URI
http://hdl.handle.net/10203/286263
Appears in Collection
ME-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 9 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0